Page 2 of 6 FirstFirst 123456 LastLast
Results 11 to 20 of 57

Thread: New High side Diode driver and TEC Driver

  1. #11
    Join Date
    Dec 2006
    Location
    Essex, UK
    Posts
    8,648

    Default

    Quote Originally Posted by drlava View Post
    nice cant see if it has a thermometer to regulate the temp
    Eat Sleep Lase Repeat

  2. #12
    Join Date
    Dec 2008
    Location
    veenwouden
    Posts
    2,580

    Default

    yes i ment like the one from laserextreme but for some reason it,s still not for sale and the only one that is for sale is the one from Kvant. Is there no one who noticed this huge hole in the market?

  3. #13
    Join Date
    Apr 2008
    Location
    Amsterdam, NL
    Posts
    2,098

    Default

    Quote Originally Posted by andy_con View Post
    nice cant see if it has a thermometer to regulate the temp
    Yes it got a temp regulated tec to keep everything within a 1 degree.

    Very soon there will be a correct datasheet and the first batch will be finished.

    So I'm ready for orders.

  4. #14
    Join Date
    Dec 2008
    Location
    veenwouden
    Posts
    2,580

    Default

    At least someone has a nose for a bussines oppertunity

  5. #15
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,702

    Default

    I very quickly drew this up in Protel.. See attached. I also added a cap across the diode, C4, and also a soft start cap, C8.. I would love someone to run another pair of eyes over the schematic Anyone who finds errors will receive a free board ( unpopulated )

    My intention is to get a run of boards done to satisfy my own needs, but as I usually get a 100 or 150sq inch sheet done, there will be many many more boards than I will need.. So in the spirit of this thread, if anybody wants a board/s, I will be more than happy to part with the spare boards at what they cost me ( which shouldn't be much at all, maybe a couple of dollars a board )

    Just thinking of some clever ways to make the board somewhat modular, IE, if you need 2 drivers, sit the boards side by side and add some short wire links to join up power and mod.. Perhaps I might do up a board that contains 4 drivers plus the TEC controller
    Attached Thumbnails Attached Thumbnails HSdrive.JPG  

    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  6. #16
    Join Date
    Aug 2009
    Location
    Bristol, England
    Posts
    333

    Default

    Ok, question:

    U1B is wired open loop inverting and fed with positive bias and modulation, how is that supposed to work :-)? In fact it is worse then that, it has positive feedback!

    I think you just have the input pins on U1B the wrong way around.

    In fact given the single supply, building any kind of inverting amplifier here is tough (but should be unnecassary).

    Also, The two trimmers (for modulation and bias) are wired as variable resistors rather then potentiometers, which both hurts linearity and causes any problem with the wiper contact to force the thing to full current (surely not what is desired?).

    Finally for all the speed of the opamp, there is a 10K resistor R7 in parallel with C7 forming a lowpass pole inside the feedback loop, is this really stable in the presence of a 130Mhz GBP opamp?).

    Regards, Dan.

  7. #17
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,702

    Default

    Right you are. Mistakes are what happens when I copy something in the middle of the night!


    Quote Originally Posted by DMills View Post
    Ok, question:

    U1B is wired open loop inverting and fed with positive bias and modulation, how is that supposed to work :-)? In fact it is worse then that, it has positive feedback!

    I think you just have the input pins on U1B the wrong way around.

    In fact given the single supply, building any kind of inverting amplifier here is tough (but should be unnecassary).

    Also, The two trimmers (for modulation and bias) are wired as variable resistors rather then potentiometers, which both hurts linearity and causes any problem with the wiper contact to force the thing to full current (surely not what is desired?).

    Finally for all the speed of the opamp, there is a 10K resistor R7 in parallel with C7 forming a lowpass pole inside the feedback loop, is this really stable in the presence of a 130Mhz GBP opamp?).

    Regards, Dan.
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  8. #18
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,702

    Default

    Board designed up.. Still needs some tidying up, but well on the way

    I decided to just do a single channel board.. If more 'channels' are needed, they can be stacked vertically via spacers..
    Attached Thumbnails Attached Thumbnails hsboard.JPG  

    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  9. #19
    Join Date
    Feb 2010
    Location
    Melbourne, Australia
    Posts
    1,106

    Default

    Quote Originally Posted by dave View Post
    I decided to just do a single channel board.
    I assume that would be 1 channel TEC and diode driver combined? How many would you need to drive a quad (say 4 Opnext HL6385 or 4 Nichia 150mW 445nm diodes)?

  10. #20
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,702

    Default

    Quote Originally Posted by taggalucci View Post
    I assume that would be 1 channel TEC and diode driver combined? How many would you need to drive a quad (say 4 Opnext HL6385 or 4 Nichia 150mW 445nm diodes)?
    Nope, just a diode driver. So 4 drivers for 4 diodes.
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •